This is a Datapack and Resource Pack that shows how to add Mega Evolutions using megastones provided by ExtraMegastonesXL.
It does the following:
1. Adds a new mega form for the pokemon by replacing its species file (datapack). The item specified to mega evolve is `extramegastonesxl:megastone_1`
2. Adds a new mega texture for Mega Bronzong (resource pack)
3. Replaces the megastone_1 texture from ExtraMegastonesXL with a megastone with better colors that fit Bronzong (resource pack)
4. Replace the megastone_1 language translation so it appears as "Bronzonite" (resource pack)
You can make your own Mega Evolutions by following or copying this. If you don't understand the datapack format, look at the existing JSON files that are shipped with the pixelmon jar.
Note, this example is made for 1.16.5! The resource pack will still work for 1.20.2, but the datapack has a slightly different format.
